WATER /METH INJ Dyno Run results

[Tony Davila]

Okay guys I ran my car on the dyno and here is what I have found. Below is the original thread about the water meth injections.
http://www.zr1.net/forum/showthread.php?t=11233
Dyno run was done with an outside air temp of 64F. Water Meth injection is more popularly used with boosted vehicles since the air intake temp is heated up from the compression of air and the water meth injection cools the compressed air thus allowing for more usable power not being robbed from the hot air. Naturally aspirated high compression engines such as ours will benefit from the use of the water meth injection when the outside air temp is high, say in the mid to high 90s and your car is breathing in all that hot air off the asphalt.

TEST #1 BASE RUN

BASE Run no Water/Meth injection. Chart above. Temp 64F, Water Temp 180F at WOT.

Test #2 50/50 mix

Chart above was with 50/50 mix injection. I think this run is void due to I had a 5 min cool down then ran WOT. Upon completion my engine temp was 198F. I believe my engine was heat soaked and therefore my power was down. The injection of the 50/50 mix did not make a difference during that run.

TEST #3

Test #3 was run with a 75%met and 25% water mixture. I allowed the engine to cool back down to the original run temp. It resulted in 2 more HP and 6 lbs of torque more. I believe with a little more Meth it might have been more.

So for all you guys wondering how it will affect your LT5, now you know. I will continue to tweek it with a little more meth in the future. It seems to run better with more Meth than the original 50/50 mix. The benefits as stated are that it does raise your octane and help clean your pistons and valves when using it. During the summer it may be the best aid in reducing the heat in the intake and allow for full power. As you know the LT5 does not like heat.

I like the results, let me know if you have any questions.

[Schrade]

First run with no water/meth ... (NO water and NO meth???) That was just about equal to the best pull...

[Tony Davila]

Originally Posted by Schrade

First run with no water/meth ... (NO water and NO meth???) That was just about equal to the best pull...

Yep....... only 2 more HP and 6 lbs of torque added. Soooooo with the outside air temp at a nice 64F the results may not seem so impressive. But.... when the air temp is 95F plus, the water meth will cool down the air going into your engine and may return HP that would otherwise been decreased due to hot intake air temp.

[Schrade]

Makes sense there Sir! (more twist than mine, with OR without!)

[XfireZ51]

Tony,

What r the mods on the car again?

[Tony Davila]

Originally Posted by XfireZ51

Tony,

What r the mods on the car again?

Self ported heads and intake/ Inj Housing
Stage 1 reground cams (Aaron Scott) intake and exhaust
Watson Headers 1 3/4
B&B 3" exhaust with X-pipe
Alum Flywheel
3.91 gears
and bling....

[alwayscode390]

Awesome test, thanks for posting that up for us.

Was your tune changed at all? I wonder if you could tweak more from messing with the timing, since your running higher octane when on the meth? ---

[Tony Davila]

Originally Posted by alwayscode390

Awesome test, thanks for posting that up for us.

Was your tune changed at all? I wonder if you could tweak more from messing with the timing, since your running higher octane when on the meth? ---

Originally Posted by rkreigh

cool stuff. I think running pure alchy would help on my engine as the CR has been bumped to 12-1.

but keep in mind the pent roof combustion chamber and dished pistons on the LT5 are very detonation resistant so the bottom line is that if your fuel and octane aren't detonating, you won't make much power.

we tried advancing timing on my motor and it didn't detonate, but it didn't make any more power either. the LPE calibration had like 31 degree and marc used 29 and it did just as well. LPE was hoping the engine would make a bit more power running race gas. wasn't needed.

no doubt that cleaning the carbon off and keeping everything clean will help the engine. one "bad side effect" of the LT5 is it tends to be a "carbon machine" and unless it gets enough time at WOT stretching it's legs, it tends to get carboned up.

from what I see on the direct injection engines, not having the fuel to help clean off the valves can be a real issue. so alchy injection into the intake to "rinse it off" makes alot of sense.

I run alchy injection on the TT Z06 and it allows me to crank the boost from 13 to 17 psi running pump gas. but the HP goes from 600 to 800 at the tires which honestly is more than I can hook up so it doesn't get used.

I'm going to run some through at a lower setting just to clean off the valves and pistons and see if it runs better as soon as we get some hot weather. (poor mans seafoam)

Read above, this may answer your question about advancing the timing. I believe more timing doesn't add anything with our engine. It is pretty much at its best.

[XfireZ51]

Originally Posted by Tony Davila

Read above, this may answer your question about advancing the timing. I believe more timing doesn't add anything with our engine. It is pretty much at its best.

Tony,

On my last series of dyno tuning, I had timing cranked to 34D. No knock but when I dropped it to 31D with an AFR change, picked up 8-10rwhp.

[Tony Davila]

Originally Posted by XfireZ51

Tony,

On my last series of dyno tuning, I had timing cranked to 34D. No knock but when I dropped it to 31D with an AFR change, picked up 8-10rwhp.

That is cool, I didn't want to modify my own calibration just for the use of water/meth injection. I didn't want my engine dependent on using it all the time, only when I deemed necessary.